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andesite |
Also found in: Encyclopedia, Wikipedia, Hutchinson | 0.02 sec. |
andesite [ˈændɪˌzaɪt] n (Earth Sciences / Geological Science) a fine-grained tan or grey volcanic rock consisting of plagioclase feldspar, esp andesine, amphibole, and pyroxene [from Andes + -ite1]
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Mineralization is hosted within a central andesitic volcanic
complex. A series of mineralized quartz latite dikes that has
intruded the basal andesitic volcanic units is known to host silver
mineralization over a wide zone that extends into the Montecristo III
concession. Indeed, bedrock float reported form the Karfakolo prospect
includes altered metasediments displaying fresh, disseminated pyrite,
coarse grained dolerite, dacitic to andesitic volcanics, hornfeled
metasediments and sheared acidic intrusive. |
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